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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2021-07-15 08:52:44 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2021-07-19 14:12:29 -0300 |
| commit | 469761eac842663365bba3dacd4cdf15a2ae328d (patch) | |
| tree | 570826e6942f9bc0bb7eec6bb34dedec141e0d01 /sysdeps/x86/tst-cpu-features-cpuinfo.c | |
| parent | 5adb0e14a5cc9e011e58a7aaf193b598ecbd7b07 (diff) | |
| download | glibc-469761eac842663365bba3dacd4cdf15a2ae328d.tar.gz glibc-469761eac842663365bba3dacd4cdf15a2ae328d.tar.xz glibc-469761eac842663365bba3dacd4cdf15a2ae328d.zip | |
elf: Fix tst-cpu-features-cpuinfo on some AMD systems (BZ #28090)
The SSBD feature is implemented in 2 different ways on AMD processors: newer systems (Zen3) provides AMD_SSBD (function 8000_0008, EBX[24]), while older system provides AMD_VIRT_SSBD (function 8000_0008, EBX[25]). However for AMD_VIRT_SSBD, kernel shows both 'ssdb' and 'virt_ssdb' on /proc/cpuinfo; while for AMD_SSBD only 'ssdb' is provided. This now check is AMD_SSBD is set to check for 'ssbd', otherwise check if AMD_VIRT_SSDB is set to check for 'virt_ssbd'. Checked on x86_64-linux-gnu on a Ryzen 9 5900x. Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
Diffstat (limited to 'sysdeps/x86/tst-cpu-features-cpuinfo.c')
| -rw-r--r-- | sysdeps/x86/tst-cpu-features-cpuinfo.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/sysdeps/x86/tst-cpu-features-cpuinfo.c b/sysdeps/x86/tst-cpu-features-cpuinfo.c index f457e8677b..76bf5b2653 100644 --- a/sysdeps/x86/tst-cpu-features-cpuinfo.c +++ b/sysdeps/x86/tst-cpu-features-cpuinfo.c @@ -236,7 +236,18 @@ do_test (int argc, char **argv) if (cpu_features->basic.kind == arch_kind_intel) fails += CHECK_PROC (ssbd, SSBD); else if (cpu_features->basic.kind == arch_kind_amd) - fails += CHECK_PROC (ssbd, AMD_SSBD); + { + /* This feature is implemented in 2 different ways on AMD processors: + newer systems provides AMD_SSBD (function 8000_0008, EBX[24]), + while older system proviseds AMD_VIRT_SSBD (function 8000_008, + EBX[25]). However for AMD_VIRT_SSBD, kernel shows both 'ssbd' + and 'virt_ssbd' on /proc/cpuinfo; while for AMD_SSBD only 'ssbd' + is provided. */ + if (HAS_CPU_FEATURE (AMD_SSBD)) + fails += CHECK_PROC (ssbd, AMD_SSBD); + else if (HAS_CPU_FEATURE (AMD_VIRT_SSBD)) + fails += CHECK_PROC (virt_ssbd, AMD_VIRT_SSBD); + } fails += CHECK_PROC (sse, SSE); fails += CHECK_PROC (sse2, SSE2); fails += CHECK_PROC (pni, SSE3); |